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diff --git a/lib/shared/mention-utils.js b/lib/shared/mention-utils.js
--- a/lib/shared/mention-utils.js
+++ b/lib/shared/mention-utils.js
@@ -5,6 +5,10 @@
import SearchIndex from './search-index';
import { stringForUserExplicit } from './user-utils';
+const mentionRegex: RegExp = new RegExp(
+ `(?<textPrefix>(?:^(?:.|\n)*\\s+)|^)@(?<username>${oldValidUsernameRegexString})?$`,
+);
+
function getTypeaheadUserSuggestions(
userSearchIndex: SearchIndex,
usersInThread: $ReadOnlyArray<RelativeMemberInfo>,
@@ -13,17 +17,51 @@
const userIDs = userSearchIndex.getSearchResults(typedPrefix);
return usersInThread
- .filter(
- (user: RelativeMemberInfo) =>
- typedPrefix.length === 0 || userIDs.includes(user.id),
- )
+ .filter(user => typedPrefix.length === 0 || userIDs.includes(user.id))
.sort((userA, userB) =>
stringForUserExplicit(userA).localeCompare(stringForUserExplicit(userB)),
);
}
-const mentionRegex: RegExp = new RegExp(
- `(^|.* )@(${oldValidUsernameRegexString})?$`,
-);
+function getCaretOffsets(
+ textarea: ?HTMLTextAreaElement,
+ text: string,
+): { caretTopOffset: number, caretLeftOffset: number } {
+ if (!textarea) {
+ return { caretTopOffset: 0, caretLeftOffset: 0 };
+ }
+
+ // terribly hacky but it works I guess :D
+ // we had to use it, as it's hard to count lines in textarea
+ // and track cursor position within it as
+ // lines can be wrapped into new lines without \n character
+ // as result of overflow
+ const textareaStyle: CSSStyleDeclaration = window.getComputedStyle(
+ textarea,
+ null,
+ );
+ const div = document.createElement('div');
+
+ for (const styleName of textareaStyle) {
+ div.style.setProperty(styleName, textareaStyle.getPropertyValue(styleName));
+ }
+
+ div.style.display = 'inline-block';
+ div.style.position = 'absolute';
+ div.textContent = text;
+
+ const span = document.createElement('span');
+ span.textContent = textarea.value.slice(text.length);
+ div.appendChild(span);
+
+ document.body?.appendChild(div);
+ const { offsetTop, offsetLeft } = span;
+ document.body?.removeChild(div);
+
+ return {
+ caretTopOffset: offsetTop - textarea.scrollTop,
+ caretLeftOffset: offsetLeft,
+ };
+}
-export { getTypeaheadUserSuggestions, mentionRegex };
+export { mentionRegex, getTypeaheadUserSuggestions, getCaretOffsets };

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